impermeableness

from WordNet (r) 3.0 (2006)

impermeableness
    n 1: the property of something that cannot be pervaded by a
         liquid [syn: {impermeability}, {impermeableness}] [ant:
         {permeability}, {permeableness}]

from The Collaborative International Dictionary of English v.0.48

Impermeable \Im*per"me*a*ble\, a. [Pref. im- not + permeable:
   cf. F. imperm['e]able, L. impermeabilis.]
   Not permeable; not permitting passage, as of a fluid. through
   its substance; impervious; impenetrable; as, India rubber is
   impermeable to water and to air. -- {Im*per"me*a*ble*ness},
   n. -- {Im*per"me*a*bly}, adv.
   [1913 Webster]